diff --git a/app/graphql/api/v2/stored_query.rb b/app/graphql/api/v2/stored_query.rb
index 1c48a5bd1..b246cc22b 100644
--- a/app/graphql/api/v2/stored_query.rb
+++ b/app/graphql/api/v2/stored_query.rb
@@ -894,6 +894,20 @@ class API::V2::StoredQuery
     }
   }
 
+  mutation dossierModifierAnnotationDropDownList(
+    $input: DossierModifierAnnotationDropDownListInput!
+  ) {
+    dossierModifierAnnotationDropDownList(input: $input) {
+      annotation {
+        id
+        value: stringValue
+      }
+      errors {
+        message
+      }
+    }
+  }
+
   mutation dossierModifierAnnotationIntegerNumber(
     $input: DossierModifierAnnotationIntegerNumberInput!
   ) {
diff --git a/app/graphql/mutations/dossier_modifier_annotation.rb b/app/graphql/mutations/dossier_modifier_annotation.rb
index de467fa00..aca7fb396 100644
--- a/app/graphql/mutations/dossier_modifier_annotation.rb
+++ b/app/graphql/mutations/dossier_modifier_annotation.rb
@@ -65,6 +65,8 @@ module Mutations
         TypeDeChamp.type_champs.fetch(:datetime)
       when :integer_number
         TypeDeChamp.type_champs.fetch(:integer_number)
+      when :drop_down_list
+        TypeDeChamp.type_champs.fetch(:drop_down_list)
       end
     end
   end
diff --git a/app/graphql/mutations/dossier_modifier_annotation_drop_down_list.rb b/app/graphql/mutations/dossier_modifier_annotation_drop_down_list.rb
new file mode 100644
index 000000000..5136242c7
--- /dev/null
+++ b/app/graphql/mutations/dossier_modifier_annotation_drop_down_list.rb
@@ -0,0 +1,17 @@
+module Mutations
+  class DossierModifierAnnotationDropDownList < Mutations::DossierModifierAnnotation
+    description "Modifier l’annotation d'un champs de type dropdown list."
+
+    argument :value, GraphQL::Types::String, required: true
+
+    def resolve(dossier:, annotation_id:, instructeur:, value:)
+      resolve_with_type(dossier:, annotation_id:, instructeur:, value:)
+    end
+
+    private
+
+    def input_type
+      :drop_down_list
+    end
+  end
+end
diff --git a/app/graphql/schema.graphql b/app/graphql/schema.graphql
index c422408fe..1ae80f784 100644
--- a/app/graphql/schema.graphql
+++ b/app/graphql/schema.graphql
@@ -1937,6 +1937,45 @@ type DossierModifierAnnotationDatetimePayload {
   errors: [ValidationError!]
 }
 
+"""
+Autogenerated input type of DossierModifierAnnotationDropDownList
+"""
+input DossierModifierAnnotationDropDownListInput {
+  """
+  Annotation ID
+  """
+  annotationId: ID!
+
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+
+  """
+  Dossier ID
+  """
+  dossierId: ID!
+
+  """
+  Instructeur qui demande la modification.
+  """
+  instructeurId: ID!
+  value: String!
+}
+
+"""
+Autogenerated return type of DossierModifierAnnotationDropDownList.
+"""
+type DossierModifierAnnotationDropDownListPayload {
+  annotation: Champ
+
+  """
+  A unique identifier for the client performing the mutation.
+  """
+  clientMutationId: String
+  errors: [ValidationError!]
+}
+
 """
 Autogenerated input type of DossierModifierAnnotationIntegerNumber
 """
@@ -3278,6 +3317,16 @@ type Mutation {
     input: DossierModifierAnnotationDatetimeInput!
   ): DossierModifierAnnotationDatetimePayload
 
+  """
+  Modifier l’annotation d'un champs de type dropdown list.
+  """
+  dossierModifierAnnotationDropDownList(
+    """
+    Parameters for DossierModifierAnnotationDropDownList
+    """
+    input: DossierModifierAnnotationDropDownListInput!
+  ): DossierModifierAnnotationDropDownListPayload
+
   """
   Modifier l’annotation au format nombre entier.
   """
diff --git a/app/graphql/types/mutation_type.rb b/app/graphql/types/mutation_type.rb
index b9ad5a92c..286cbeac3 100644
--- a/app/graphql/types/mutation_type.rb
+++ b/app/graphql/types/mutation_type.rb
@@ -19,6 +19,7 @@ module Types
     field :dossier_modifier_annotation_datetime, mutation: Mutations::DossierModifierAnnotationDatetime
     field :dossier_modifier_annotation_integer_number, mutation: Mutations::DossierModifierAnnotationIntegerNumber
     field :dossier_modifier_annotation_ajouter_ligne, mutation: Mutations::DossierModifierAnnotationAjouterLigne
+    field :dossier_modifier_annotation_drop_down_list, mutation: Mutations::DossierModifierAnnotationDropDownList
 
     field :groupe_instructeur_modifier, mutation: Mutations::GroupeInstructeurModifier
     field :groupe_instructeur_creer, mutation: Mutations::GroupeInstructeurCreer
diff --git a/spec/controllers/api/v2/graphql_controller_spec.rb b/spec/controllers/api/v2/graphql_controller_spec.rb
index f54c63190..4382eb52c 100644
--- a/spec/controllers/api/v2/graphql_controller_spec.rb
+++ b/spec/controllers/api/v2/graphql_controller_spec.rb
@@ -1230,9 +1230,13 @@ describe API::V2::GraphqlController do
       end
 
       describe 'dossierModifierAnnotation' do
-        let(:procedure) { create(:procedure, :published, :for_individual, :with_service, :with_all_annotations, administrateurs: [admin]) }
+        let(:procedure) do
+          create(:procedure, :published, :for_individual, :with_service, administrateurs: [admin], types_de_champ_private:)
+        end
 
         describe 'text' do
+          let(:types_de_champ_private) { [{ type: :text }] }
+
           let(:query) do
             "mutation {
               dossierModifierAnnotationText(input: {
@@ -1266,6 +1270,8 @@ describe API::V2::GraphqlController do
         end
 
         describe 'checkbox' do
+          let(:types_de_champ_private) { [{ type: :checkbox }] }
+
           let(:value) { 'true' }
 
           let(:query) do
@@ -1316,6 +1322,7 @@ describe API::V2::GraphqlController do
         end
 
         describe 'yes_no' do
+          let(:types_de_champ_private) { [{ type: :yes_no }] }
           let(:value) { 'true' }
 
           let(:query) do
@@ -1366,6 +1373,8 @@ describe API::V2::GraphqlController do
         end
 
         describe 'date' do
+          let(:types_de_champ_private) { [{ type: :date }] }
+
           let(:query) do
             "mutation {
               dossierModifierAnnotationDate(input: {
@@ -1399,6 +1408,8 @@ describe API::V2::GraphqlController do
         end
 
         describe 'datetime' do
+          let(:types_de_champ_private) { [{ type: :datetime }] }
+
           let(:query) do
             "mutation {
               dossierModifierAnnotationDatetime(input: {
@@ -1431,7 +1442,44 @@ describe API::V2::GraphqlController do
           end
         end
 
+        describe 'drop_down_list' do
+          let(:drop_down_list_options) { ['bijour'] }
+          let(:types_de_champ_private) { [{ type: :drop_down_list, options: drop_down_list_options }] }
+          let(:query) do
+            "mutation {
+              dossierModifierAnnotationDropDownList(input: {
+                dossierId: \"#{dossier.to_typed_id}\",
+                annotationId: \"#{dossier.champs_private.find { |c| c.type_champ == 'drop_down_list' }.to_typed_id}\",
+                instructeurId: \"#{instructeur.to_typed_id}\",
+                value: \"#{value}\"
+              }) {
+                annotation {
+                  stringValue
+                }
+                errors {
+                  message
+                }
+              }
+            }"
+          end
+
+          context "success" do
+            let(:value) { drop_down_list_options.first }
+            it 'should be a success' do
+              expect(gql_errors).to eq(nil)
+
+              expect(gql_data).to eq(dossierModifierAnnotationDropDownList: {
+                annotation: {
+                  stringValue: dossier.reload.champs_private.find { |c| c.type_champ == 'drop_down_list' }.to_s
+                },
+                errors: nil
+              })
+            end
+          end
+        end
+
         describe 'integer_number' do
+          let(:types_de_champ_private) { [{ type: :integer_number }] }
           let(:query) do
             "mutation {
               dossierModifierAnnotationIntegerNumber(input: {